Mold for casting rings.



PATENTED DEC. 15, 1903.

w. H. FORD.

MOLD FOR GASTING RINGS. APPLICATION FILED MAR. 23 -1903.

No MODEL.

No. 746,944. Patented December 15, 1903.

UNITED STATESPATENT OFFICE.

v WILLIAM H. FORD, OF LOWELL, MASSACHUSETTS, ASSIGNOR TO RINGSET COMPANY, OF PORTLAND, MAINE.

MOLD FOR CASTING RINGS.

SPECIFICATION forming part of Letters Patent No. 746,944, dated December 15, 1903. Application filed March'23, 1903. Serial No. 149,020. (No model.)

To all whom it may concern: spond in shape substantially with the de- Be it known that 1, WILLIAM H. FORD, a tached non-metallicdestructible core d to be citizen of theUnited States,residingatLoweil, used in the mold to determine the finger-size county of Middlesex, State of Massachusetts, of the ring to be cast. 5 have invented an Improvement in'Molds for For the production of the described mold OastingRings,of which thefollowingdescrip- I mount a pattern-ring e, Fig. 6, of any detion, in connection with the accompanying sired shape on a metallic ring-holderfand drawings, is a specification, like characters on force a part .of the exterior of said patternthe drawings representing like parts. ring and the periphery of the ring-holder into 10 This invention has for its object the prothe mold material, preferably cnttlefish. As duction of a novel mold in which to cast in shown in Fig. 5, substantially one-half of the a novel manner finger-rings. pattern-ring e, from its widest part or top to The novel mold shown as embodying my its lower side, and of the holder is embedded invention for finger-ring casting comprises a in the section aand the other half of the ring x5 pluralityof pieces of mold material, each conand holder in the other section b. The ring caved atits face to embraceacore correspondforms the depressions a b, and the holder ing substantially with the finger size of the forms the concavities o. ring to be cast, each concavity containing a The holder is alittle longer than the widest depression corresponding in shape with the partofthe pattern-ring, and consequently the 2o. exterior of the ring, of whatever shape, to be depression for outlining the exterior of the cast, each depression serving to define the exring to be cast is at its widest part a little narterior of the ring from edge to edge. rower than the surface of the cuttlefish acted Figure 1, in side elevation, represents one upon by the holder, so that the depressions of myimproved molds and a detachable a'uxare made within the area of cuttlefish that 25 iliary runway assembled,the core of the mold is concaved. by the holder. This construcbeing represented by dotted lines. Fig. 2 is tion enables the depressions of whatever a longitudinal section of the mold and run-- width, that depending upon the outline of way shown in Fig. 1 with the core in elevathe ring to be cast, to be crossed by the core tion, the section being in the line at, Fig. 3. located in the concavities, the core prevent- 8o 0 Fig. 3 isa cross-section of the'moid and core ing' gold entering the depressions from eswith the core in elevation. Fig. 4 is a seccaping between the core and the surrounding tion of one of the mold parts in the line x, mold material. Fig. 5, looking toward the narrowest part of The drawings show the ring depressions a the impression. Fig. 5 shows the face of one b in the mold-pieces ct-h shaped to cast a ring 5 01": the mold parts with the core omitted to to embrace substantially one half of the finshow a concavity and a depression. Fig. 6 ger from the top to the under side thereof, shows the holder and pattern-ring employed and the shape of the part 2* of the depresin the formation of the concavities and desion, due to the shape of the pattern-ring, is pressions, Figs. 1 to 3. Fig. 7 shows part of such as to provide for casting a. ring having 0 40 the top of the ring to illustrate the position an enlarged or wider or heavier top or crown of the fin left at the meetingfaces of the mold- 2 to rest on the top of the finger.

sections. Fig. Sshows detached the core illus- I designate the large or wider part 2 of the trated in Fig. 3, and Figs. 9 and 10. show ring as the top, and the top and theshank 3 modified forms of core. of the ring below it may be of any shape com- 5 The novel mold herein disclosed for casting monly used in rings-as, for instance, seal or finger-rings comprises a plurality of pieces or signet rings, stone rings, figure-rings, &c. sections Ct 17 of mold material, each having a and, as shown in Fig. 5, the portion 2 of the like concavity c, in each of which are depresdepressions in the mold-pieces are wider than sions a. Z), corresponding in shape with the the portions 3* of the depressions that shape I00 0 cross-section of the ring to be cast from one the part of the shank 3 of the ring crossing to its other edge. The concavities c correthe under side of the finger. This invention is not limited, however, to the width or depth orparticular configuration of the depressions a and b, as they may vary with the style, width, and thickness of the top and under part of the ring to be cast.

The cavity in each mold-piece may embrace more or less of the core, according to the style of ring to be cast.

As shown in Fig. 1, Where the mold is assembled, the periphery of the core is surrounded by the concavities c, and the ends of the core contact with the inner sides of the walls 0 thereof. (See Fig. 3.) The periphery of the core crosses fully the depressions a b of whatever shape, defining the exterior outline of the ring to be cast from one to its other edge, and said core forms an inner wall for said depressions, so that the molten metal entering the depressions and surrounding the charcoal core is enabled to cool slowly, thus making the ring malleable.-

To provide for the ready escape from the mold depressions of the air therein when the metal enters, and thereby avoid pin or blow holes in the castings, the core is provided with peripheral vent-slits g, that preferably intersecta hole h, made through the core from one to its other end.

The peripheral vent-slits g, Fig. 8,are made circumferentially of the core or at right angles to the longitudinal axis of the core, while the slits 9' (see Fig. 10) are made longitudinally of the core. These vent-slits are made with an excessively fine saw that will enable the air to pass readily through the slits, but will exclude the injurious passage of gold therethrough from the mold.

Each part of the mold shown may have in its outer face between its ends a runway m for the entrance of the molten metal into the ring depressions a b of the assembled mold.

I find that the mold depressions will fill more accurately if the molten gold is permitted to get some force or impetus when entering the runway leading to the mold depressions. As a result of my experiments in this direction I have discovered that the employment of an auxiliary detachable runway 02 to lead the gold to the runway m of the mold-sections gives force and impetus to the gold, provided the material of the auxiliary runway is such as not to cool or to exerta retarding friction on the melted gold. This auxiliary runway for the best results should be of charcoal, as it will not injuriously cool the gold, nor will the charcoal exert friction on the gold, as would cuttlefish.

It is immaterial where the runway-intersects with the depressions shaping the exterior of the ring, so this invention is not limited to the exact spot shown for the runway m, as the latter may be in either mold-piece at any desired point; but the position of the runway in Fig. l is considered preferable.

Inasmuch as the depressions in the moldpieees shape the ring from edge to edge and the casting surrounds the one-piece core, it

follows that the interior of the ring fitting the core is cast smooth and that the exterior of the ring shows a fiu'only where the moldpieces abut one the other, as at 19, Figs. 6 and 7, and consequently the interior and exterior of the ring is devoid of the usual fins extending thereabout centrally, as is customary in all rings cast in cuttlefish or other material wherein one half of the ring in the direction of its thickness is cast in one moldsection and the other half in another mold-section, the core part integral with each mold part abutting when the mold parts are put together.

As the only mold-marks at the exterior of the ring cast in the mold herein described cross the outside of the ring substantially parallel with the longitudinal axis thereof, it follows that a ring of this class may be filed up quickly and with less waste of stock than when cast by usual processes heretofore practiced.

Aehareoal orcarbon core is sufficiently soft to permit the gold to cool thereon and shrink, and when the ring is taken from the mold the core goes with it and may be broken or cut out with a knife, the core easily breaking up in order that it may be removed.

The mold material iscut from the inner end of the walls 0', as at 0 substantiallyopposite the end of the center hole h of the core, and the air entering the vent-slits escapes through said hole with the atmosphere.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is 1 1. A mold for casting finger-rings, comprising a detachable core, and mold-sections provided each with a concavity of a size to receive the exterior of the core, each of said concavities having a depression to define the shape of the exterior of the ring from one to its opposite edge.

2. A mold for casting finger-rings, comprising a detachable charcoal core, and pieces of mold material each provided at its face between its ends with a concavity to receive the core, said concavity being provided with a depression of less width than the length of the core, the depression in each piece of mold material receiving the molten metal and forming a part of the ring from one to its other edge.

3. A mold for casting finger-rings, com prising a core having its exterior provided with vent-slits, and sections of mold material each provided at its face with a concavity shaped to receive the core, each concavity having embedded in it a depression to define the exterior of a part of the finger-embracing part of the ring from edge to edge.

4. Amold for casting finger-rings, comprising a non-metallic core having vent-slits, and pieces of mold material each provided at its face with a concavity shaped to receive the core, each concavity having embedded in it a depression to define the exterior of a part of the finger-embracingpart of the ring from edge to edge.

5. A mold for casting finger-rings, comprising a charcoal core, and pieces of cuttlefish surrounding the periphery of said core, each of said pieces of cuttlefish having impressed into its face a concavity to receive the core, and said concavities being provided with narrower depressions to shape a portion of the ring from edge to edge, whereby each moldpiece serves to form a part of the ring to embrace a considerable portion of the finger, the fin indicating the meeting faces of the cuttlefish crossing the exterior of the ring from one to its opposite edge in lines substantially parallel with the longitudinal axis of the core and ring.

6. A mold for casting finger-rings comprising a detachable core, and pieces of cuttlefish each.- having in its face a concavity to receive the core, said cuttlefish presenting side walls to overlap the ends of the core, each concavity presenting a depression to define the shape of a part of the exterior of the ring from one to its other edge, the core crossing the depressions made in the cuttlefish and preventing the escape of gold from the depressions when the latter'is cast in the assembled mold.

7. In a mold for casting finger-rings, a pinrality of pieces of mold material having each a concavity to define the finger size of the ring, the curved faces of said concavities having depressions to shape the exterior of a part of the ring from edge to edge, and a nonmetallic detachable core having a longitudinal hole and provided at its exterior with vent-slits.

8. A mold for casting finger-rings, comprising a non-metallic detachable core having a longitudinal hole, and a series of circumferential slits cut in said core, and a plurality of pieces of mold material having each a concavity to receive the core, the curved faces of said concavities having each a depression to conform in shape with the exterior of the ring to be cast from one to its other edge,

and of a length to embrace a substantial part of the finger.

9. In a mold for casting finger-ringsa plurality of pieces of mold material, each having a concavity, one of said pieces having a depression to form the top of the ring, and also a part of the shank or body thereof embracing the finger beyond the point where the inner side of that part of the ring having said top contacts with the finger, and a detachable core fitting the c'oncavities of said pieces of mold material.

10. In a mold for casting finger-rings, a plurality of pieces of mold material each having a concavity, one of said pieces having a depression shaped to form the top of the ring, and a part of the shank or body thereof embracing the finger below the top or the part thereof contacting with the top of the finger, and a detachable co re fitting said concavities, the ends of said core serving by contact with the ends of said cavities to correctly register the ring depression of the separate mold parts one with the other and prevent one mold part. from moving laterally over the other mold part.

11. A mold for casting gold, said mold comprising non-metallic material having an impression to shape one face of the article to be cast, and finely-slitted non-metallic material crossing the mold impression that quickly rises in temperature and retards the cooling of the gold in said impression, said ventilation afiording an avenue for the ready escape of'air from said impression but preventing the escape of gold therefrom, to the detriment of the casting.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

WILLIAM H. FORD.

Witnesses:

GEOKW. GREGORY, EDITH M. STODDABD. 

